Python 从 pexpect sendline 读取输出
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reading output from pexpect sendline
提问by cashman04
I have pexpect working, but I am having problems printing the output back from it. In my test script below, it creates the ssh connection, and then sends a sudo su -, then my password, and then sends a line that would require sudo access to do (I have also added p.interact() a few times to make sure it is at root). The problem I am having, is with returning the output of the commands I run. In the end I am wanting to run some top commands, and some du -h, and other(much more complex) space commands. But currently when it tries to print p.before, I get:
我有 pexpect 工作，但我在打印输出时遇到问题。在我下面的测试脚本中，它创建 ssh 连接，然后发送一个 sudo su -，然后是我的密码，然后发送需要 sudo 访问权限的行（我还添加了几次 p.interact() 以确保它在根目录下）。我遇到的问题是返回我运行的命令的输出。最后，我想运行一些顶级命令、一些 du -h 和其他（更复杂的）空间命令。但是目前当它尝试打印 p.before 时，我得到：
Traceback (most recent call last):
File "./ssh.py", line 37, in <module>
print p.before()
TypeError: 'str' object is not callable
Here is the script I am working from(edited to remove my pass and such)
这是我正在使用的脚本（编辑以删除我的通行证等）
#!/usr/bin/env python
import pexpect
import struct, fcntl, os, sys, signal
def sigwinch_passthrough (sig, data):
# Check for buggy platforms (see pexpect.setwinsize()).
if 'TIOCGWINSZ' in dir(termios):
TIOCGWINSZ = termios.TIOCGWINSZ
else:
TIOCGWINSZ = 1074295912 # assume
s = struct.pack ("HHHH", 0, 0, 0, 0)
a = struct.unpack ('HHHH', fcntl.ioctl(sys.stdout.fileno(), TIOCGWINSZ , s))
global global_pexpect_instance
global_pexpect_instance.setwinsize(a[0],a[1])
ssh_newkey = 'Are you sure you want to continue connecting'
p=pexpect.spawn('ssh user@localhost')
i=p.expect([ssh_newkey,'password:',pexpect.EOF,pexpect.TIMEOUT],1)
if i==0:
print "I say yes"
p.sendline('yes')
i=p.expect([ssh_newkey,'password:',pexpect.EOF])
if i==1:
print "I give password",
p.sendline("mypassword")
elif i==2:
print "I either got key or connection timeout"
pass
elif i==3: #timeout
pass
global global_pexpect_instance
global_pexpect_instance = p
p.sendline("sudo su -")
p.sendline("mypasswd")
p.sendline("mkdir /home/user/test")
print p.before
I am working off of this link: http://linux.byexamples.com/archives/346/python-how-to-access-ssh-with-pexpect/
我正在使用此链接：http: //linux.byexamples.com/archives/346/python-how-to-access-ssh-with-pexpect/
Any help is much appreciated.
任何帮助深表感谢。
EDIT: As Armin Rigo pointed out below. I was calling to p.before as a function like p.before(). Stupid mistake on my part, as this explains why I was getting this error today, and not yesterday when I was trying this. After making that change to my script, and modifying the command being sent, print p.before, and no output is returned. Any other ways to return output from a sendline() command?
编辑：正如 Armin Rigo 在下面指出的那样。我正在调用 p.before 作为像 p.before() 这样的函数。我犯了一个愚蠢的错误，因为这解释了为什么我今天遇到这个错误，而不是昨天我尝试这个时。在对我的脚本进行更改并修改正在发送的命令后，打印 p.before，并且不会返回任何输出。还有其他方法可以从 sendline() 命令返回输出吗？
回答by Reegan Miranda
Use logfile, that logfile is store all output in terminal.use that example code:-
使用日志文件，该日志文件将所有输出存储在终端中。使用该示例代码：-
child = pexpect.spawn("ssh user@localhost")
child.logfile = open("/tmp/mylog", "w")
child.expect(".*assword:")
child.send("guest\r")
child.expect(".*$ ")
child.sendline("python -V\r")
open the log file and see everything in terminals event
打开日志文件并查看终端事件中的所有内容
回答by IRSHAD
To fetch the complete output after sendline use child.read()
要在发送后使用child.read()获取完整的输出
e.g.
例如
cmd_resp = pexpect.spawnu(cmd) # for execution of the command
str_to_search = 'Please Enter The Password'
cmd_resp.sendline('yes') # for sending the input 'yes'
resp = cmd_resp.expect([str_to_search, 'password:', EOF], timeout=30) # fetch the output status
if resp == 1:
cmd_resp.sendline(password)
resp = cmd_resp.expect([str_to_search, 'outputString:', EOF], timeout=30)
print(cmd_resp.read()) # to fetch the complete output log
回答by Dharmendra Mishra
p.beforeis a string - not a function. To see the output you have to write
print p.before.
Hope this might help you
p.before是一个字符串 - 不是一个函数。要查看输出，您必须编写
print p.before. 希望这可以帮助你
